Lightning over Tucson, USA
Lightning. Night-time view of multiple bolts of lightning striking the ground in a city with the moon in the sky. Lightning occurs when a large electrical charge builds up in a cloud. This is probably due to the rapid movement of water droplets and ice particles within the cloud. Large thunderclouds generally have very turbulent interiors. The charge induces an opposite charge on the ground, and a few "leader electrons" travel to the ground. When one makes contact, there is a huge backflow of energy up the path of the electron. This produces a bright flash of light and temperatures of up to 30, 000 degrees celsius. Photographed in Tucson, Arizona, USA
© Keith Kent/Science Photo Library
Kitt Peak Observatory and Milky Way
Kitt Peak National Observatory, Tucson, Arizona, USA, and the Milky Way. With 23 telescopes, this is the largest collection of astronomical instruments in the world. The telescope at the highest point is the Mayall 4-metre telescope (completed in 1973)
© DAVID NUNUK/SCIENCE PHOTO LIBRARY
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Tucson Arizona US City Street Map
Vector Illustration of a City Street Map of Tucson, Arizona, USA. Scale 1:60, 000.
All source data is in the public domain.
U.S. Geological Survey, US Topo
USGS The National Map: National Hydrography Dataset (NHD)
USGS The National Map: National Transportation Dataset (NTD)
© Frank Ramspott, all rights reserved